Graphene nanoribbon winding around carbon nanotube

Stationary stable configurations of the complex of carbon nanotube of radius R0 = 0.3925 nm (number of cyclic chain nodes N0 = 20) and graphene nanoribbon of length L = (N − 1)a, where N is the number of chain nodes: (a) CNT positioned on the flat graphene nanoribbon, (b) single coil scroll, (c) double folded nanoribbon, (d) single coil scroll with cavity, (e) double coil scroll with smaller cavity, (f) dense double coil scroll, (g) three coil scroll with a cavity, (h) four coil scroll with a larger cavity.181